We just could calculate reliability among fuzzy number by AA method. When stress and strength is combination of fuzzy variable and random variable, we should change random variable into fuzzy number by formula (1)and (2) and then calculate the reliability by AA method.
AA method to calculate the reliability of the use of fuzzy variables can only be calculated for the stress and intensity of fuzzy random variables and when the combination of variables may be passed-style (1) and type (2) random variables into fuzzy variables and then calculating the reliability of AA method.